#include <iostream>
using std::cout;
using std::endl;

void test0(){
    bool b0 = 0;
    bool b1 = 1;
    bool b2 = -1;//非零的数值表示true
    bool b3 = true;
    bool b4 = false;
    if(b2){
        cout << "hello" << endl;
    }
    cout << sizeof(bool) << endl;
}

int main(void){
    test0();
    return 0;
}
